Variable inductance and coupler



Oct. 13, 1925. 1,556,612

A. J. KLONECK VARIABLE INDUCTANCE AND COUPLER Filed Dec. 15, 1921 WITNESS I NVENTOR Patented Oct. 13, 1925.

UNITED STATES 1,556,612 PATENT OFFICE.

AUGUST 3'. nomwx, OF NEW YORK, N. Y.

VARIABLE INDUCTANQE AND COUPLER.

Application fled December 15, 1821. Serial Re. 522,597.

To all whom it may concern:

Be it known that I, Aooos'r J Kromccx, a citizen of the United States, residin at New York ci in the county of New ork and State of ew York, have invented certain new and useful Im rovements in Variable Inductances and ouplers, of which the following is a s ification.

This invention re ates to variable inductances such as chiefly used for tuning alternatin or high frequency currents for radio telep oning, telegraphing, for measurements, a and for other purposes.

One object of the invention is to produce a variable inductance by moving two or more coils with respect to one another so as to have the coils-mutually magnetic or opposing one another.

Another object of the invention is to combine sets of such inductances to form cooperating coils such as the primary 'and the secondary of a transformer.

These and other allied objects are attained by the novel arrangement and combination of parts hereinafter fully described and shown in the accompanying drawings and in which Figure 1 shows a cross sectional view of the inductance. Figure 2 shows a diagrammatic view of a transformer combining several coil sets. f

Referring more. particularly to the drawings wherein similar characters denote corresponding parts, 1 is a receptacle having a cover 2 thereon. Attached upon the inner side of cover 2 are two semicircular coils 3 and 4 forming a stationary art of one set of inductance coils. Said 0011s 3 and 4 bei connected together to form opposln p ises at one side of the set. Coactmg wit said stationary coils are two rotatable coils 5 and 6. The latter are arranged upon a tubular shaft 7 which leads between coils 3 and 4 and a center hole in the cover plate 2 to a brake and dial 8 and an adjusting knob ring 10 upon the tubular shaft 7 causes 0 dial 8 to be moved with friction upon the wver 2. For this purpose the dial 8 and cover 2 are centrally undercut causing ment of a circumferential band only.

A as arate knob '9' operates by gear 9" the I dial forfineradjustments. Aseachoftherotatable coils 5 and 6 have difierent etic poles facing the stationarycoils 3 an 4 it willbenotedthatatoneposition ofthe coils such as shown, the stationary and retatable coils will mutually magnetize one another, while with rotatable coils turned around the same magnetic poles of the stationary and rotatable coils will be opposed to each other causing the inductance ofthe coil set to be zero as the same forms onecircuit with one another. Connection between the rotatable coils and the stationary part is established by two contact brushes 12 and 13 which contact with ring collectors 14 and 15.

Assuming that a separate primary and secondary lnductance is needed I arrange another coil set in inductive relation to the described coil set, the latter then forming an independent circuit for a. transformer. The second coil set comprises twononrotating coils 16 and 17 which however are slidably arranged back and forth from the first coil set so as to obtain a loose coupling ef-' fect between the two coil sets. Two rotatable coils 18 and 19 arranged on shaf-ting 20 coact with coils 16 and 17 as one coil combination. The rotating shaft 20 of coils 18 the dial 8 and knob rtion 9 to another indicating disk 21 an adjusting knob 22 arranged to move upon knob 9. A sprin 23 upon shaft 20 serves for frictioning di 21 upon knob 9. The end 25 of shaft 20 is flattened or squared and the hole of the rotating coils 18 and 19 is similarly shaped permitting asliding movement of the rotating coils 18 and 19 upon shaft 20. Said rotating coils 18 and 19 are connected with the stationary coils by two rings 27 and 28 having overlapping flanges thereupon and contacts 29 and 30 e in said flanged rings toward coils 16 an 1%.

For the sliding movement of the last coil set 16 to 19 I employ a spiral or worm threaded shaft 32 secured to a knob 33 on the cover plate 2 and engaging a spiral threaded arm 34 of the coils 16 to 19.

It will be obvious that I may omit two coils on each set or arrange three, four or six coils around theshafts or add more than two coil sets in one combination, if convenient or desirable.- Further I may employ coils of square or circular shape instead of the semicircular shape if desired.

It will be noted that such variable inductances and coupling transformers as here described have a marked advantage to the present types of coils.- Since particularl air core coils in radio signaling form sma 1 loop aerials and thus produce interaction and interference with other coil actions severalhundred feet away therefrom and also with the coils of the same set which can not be shielded therefrom, it is advantageous to em loy such parallel, oppositely wound coils as escribed so that the same will not produce an outside magnetic field or be afiected by an outside ma etic field.

Hav' now y described my invention what I c aim as new and desire to secure by Letters Patent is:

1. A variable inductance element comprising two groups of coils, respectivel stationary and revoluble, the coils 0 each group being arranged in planetary formation about a common axis and means for electricall interconnecting said groups of coils. said last means comprising contact springs and circular collectors arranged between said grou of coils.

2. A variable inductance element comprising independent coil sets, each coil set includin revoluble coil .parts and non-revoluble 00' parts, means for rotating said revoluble 0011' parts, means for electricall interconnecting revoluble and non-'revo uble coil parts of each set and means for inducv tivel separating said independent coil sets, said ast means comprisi a spiral shafting, the coils of each part i arranged m planctar formation about the axis of rotation o the revoluble part.

3. A variable inductance and coupler includin primary and a secondary coil set, means or varying the inductance relation between said primary and said secondary coil sets by a movement of the coil sets with respect to one another, means for the inductive relation between the coils of each set from having turns and magnetic eflects op sad to one another to etica y cooperating, each of said 0011 sets having a part of its coils movable in planetary direction with respect to the other part of the coils, and means for me movable coils of each set, and one set with respect to the other set.

In testimony whereof, I have signed my name to this s ification this 25t day of September, 19 9.

AUGUST J. KLONECK. 

